effectiveness

American  

[ih-fek-tiv-nis, ee-fek‐] / ɪˈfɛk tɪv nɪs, iˈfɛk‐ /

Rarely effectivity

noun

1. the quality of producing an intended or desired result.

   For maximum effectiveness of your weight loss plan, you need to combine exercise with a healthy diet.

2. the quality of producing a deep or vivid impression.

   We were struck by the evident appeal and effectiveness of these short, dramatic, upbeat video stories.

3. a measure of the success of a vaccine or other pharmaceutical when used in the real world, as opposed to the controlled environment of a clinical trial.

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Other Word Forms

• subeffectiveness noun
• supereffectiveness noun
• uneffectiveness noun

Etymology

Origin of effectiveness

First recorded in 1600–10; effective ( def. ) + -ness ( def. )

Example Sentences

The researchers said the results support the effectiveness of earplugs, which are used by up to 16 percent of Americans to help them sleep.

From Science Daily

But Olberg acknowledged that the organisation's effectiveness was increasingly being questioned.

From Barron's

This change helped stabilize the catalyst and maintain its effectiveness.

From Science Daily

The "resolute investigation and punishment" of Zhang and Liu "removes roadblocks" and "squeezes out the water diluting combat effectiveness", it said.

From Barron's

AI is optimizing search, discovery, pricing, and sales language in real time, shifting competition towards algorithmic effectiveness over scale.

From Barron's

Related Words

• capability
• efficacy
• efficiency
• potency
• power
• success